Moved Codec.AsciiKey256 to tox-crypto.

1 files changed, 0 insertions, 146 deletions

diff --git a/dht/src/Codec/AsciiKey256.hs b/dht/src/Codec/AsciiKey256.hs
deleted file mode 100644
index 1738a368..00000000
--- a/dht/src/Codec/AsciiKey256.hs
+++ /dev/null
@@ -1,146 +0,0 @@
-{-# LANGUAGE TupleSections #-}
-module Codec.AsciiKey256 where
-
-import Control.Applicative
-import Control.Monad
-import Control.Monad.Fail                     as MF
-import Data.Bits
-import qualified Data.ByteArray               as BA
-         ;import Data.ByteArray               as BA (ByteArrayAccess)
-import qualified Data.ByteString              as B
-         ;import Data.ByteString              (ByteString)
-import qualified Data.ByteString.Base16       as Base16
-import qualified Data.ByteString.Base32.Z     as Base32
-import qualified Data.ByteString.Base64       as Base64
-import qualified Data.ByteString.Char8        as C8
-import Data.Char
-import Data.Int
-import qualified Data.Text                    as T
-         ;import Data.Text                    (Text)
-import Data.Word
-import Foreign.Ptr
-import System.IO.Unsafe
-import qualified Text.ParserCombinators.ReadP as RP
-
-stripSuffix :: Text -> Text -> Maybe Text
-stripSuffix suf x = case T.splitAt (T.length x - T.length suf) x of
-    (y,end) | end == suf -> Just y
-            | otherwise  -> Nothing
-
-hexdigit :: Char -> Bool
-hexdigit c = ('0' <= c && c <= '9') || ( 'a' <= c && c <= 'f') || ( 'A' <= c && c <= 'F')
-
-b64digit :: Char -> Bool
-b64digit '.' = True
-b64digit '+' = True
-b64digit '-' = True
-b64digit '/' = True
-b64digit c = ('0' <= c && c <= '9') || ( 'a' <= c && c <= 'z') || ( 'A' <= c && c <= 'Z')
-
--- | Convert to and from a Base64 variant that uses .- instead of +/.
-nmtoken64 :: Bool -> Char -> Char
-nmtoken64 False '.' = '+'
-nmtoken64 False '-' = '/'
-nmtoken64 True  '+' = '.'
-nmtoken64 True  '/' = '-'
-nmtoken64 _     c   = c
-
-
--- Apply substitutions for mistaken z-base32 digits.
-fixupDigit32 :: Char -> Char
-fixupDigit32 'l' = '1'
-fixupDigit32 '2' = 'z'
-fixupDigit32 'v' = 'u'
-fixupDigit32  c  =  c
-
-zb32digit :: Char -> Bool
-zb32digit '1' = True
-zb32digit c = or [ '3' <= c && c <= '9'
-                 , 'a' <= c && c <= 'k'
-                 , 'm' <= c && c <= 'u'
-                 , 'w' <= c && c <= 'z'
-                 ]
-
-
--- | Parse 43-digit base64 token into 32-byte bytestring.
-parseToken32 :: String -> Either String ByteString
-parseToken32 str = fmap (BA.drop 1) $ Base64.decode $ C8.pack $ 'A':map (nmtoken64 False) (take 43 str)
-
--- | Encode 43-digit base64 token from 32-byte bytestring.
-showToken32 :: ByteArrayAccess bin => bin -> String
-showToken32 bs = map (nmtoken64 True) $ C8.unpack $ BA.drop 1 $ Base64.encode $ BA.cons 0 $ BA.convert bs
-
-foreign import ccall "crc4itu" c_crc4itu :: Word8        -- ^ init crc
-                                            -> Ptr Word8 -- ^ data to checksum
-                                            -> Int32     -- ^ length of data
-                                            -> IO Word8  -- crc in low 4 bits
-
--- | CRC4-ITU. Return crc in lowest 4 bits.
-crc4itu :: ByteArrayAccess ba => Word8 -- ^ Existing CRC value (usually 0x00) before process a new one.
-                                 -> ba -- ^ Data to checksum.
-                                 -> Word8
-crc4itu crc0 b = unsafePerformIO $ BA.withByteArray b $ \p ->
-    c_crc4itu crc0 p (fromIntegral $ BA.length b)
-
--- | Parse 52-digit z-base32 token into 32-byte bytestring.
-parse32Token32 :: String -> Either String ByteString
-parse32Token32 str = do
-    bs <- Base32.decode $ C8.pack $ map (fixupDigit32 . toLower) (take 52 str) ++ "y"
-    case BA.splitAt 32 bs of
-        (key,mac) | crc4itu 0 key == shiftR (BA.index mac 0) 4
-            -> Right key
-        _   -> Left "Failed cyclic redundancy check."
-
--- | Encode 52-digit z-base32 token from 32-byte bytestring.
-show32Token32 :: ByteArrayAccess bin => bin -> String
-show32Token32 bs = C8.unpack $ B.take 52 $ Base32.encode (b `B.snoc` shiftL crc 4)
- where
-    b = BA.convert bs
-    crc = crc4itu 0 bs
-
-
-readsPrecKey256 :: (ByteString -> Maybe a) -> [Char] -> [(a, [Char])]
-readsPrecKey256 publicKey str
-        | (bs,_) <- Base16.decode (C8.pack $ take 64 str)
-        , Just pub <- publicKey bs
-                    = [ (pub, drop (2 * B.length bs) str) ]
-        | Right bs <- parse32Token32 str
-        , Just pub <- publicKey bs
-                    = [ (pub, drop 52 str) ]
-        | Right bs <- parseToken32 str
-        , Just pub <- publicKey bs
-                    = [ (pub, drop 43 str) ]
-        | otherwise = []
-
-
-parseKey256 :: (MonadFail m, Alternative m) => String -> m ByteString
-parseKey256 nidstr = do
-        let nidbs  = C8.pack nidstr
-            (bs,_) = Base16.decode nidbs
-            enid   = case C8.length nidbs of
-                        52 -> parse32Token32 nidstr
-                        43 -> parseToken32 nidstr
-                        _  -> Left "Wrong size of key."
-        idbs <- (guard (B.length bs == 32) >> return bs)
-                <|> either MF.fail return enid
-        return idbs
-
-readP_key256 :: RP.ReadP ByteString
-readP_key256 = do
-      (is64,hexhash) <- foldr1 (RP.+++)
-        [ fmap (16,) (sequence $ replicate 64 (RP.satisfy isHexDigit))
-        , fmap (32,) (sequence $ replicate 52 (RP.satisfy zb32digit))
-        , fmap (64,) (sequence $ replicate 43 (RP.satisfy b64digit))
-        ]
-      let failure = MF.fail "Bad key."
-      case is64 of
-        32 -> case parse32Token32 hexhash of
-                  Right bs -> return bs
-                  _        -> failure
-        64 -> case parseToken32 hexhash of
-                  Right bs -> return bs
-                  _        -> failure
-        16 -> case Base16.decode $ C8.pack hexhash of
-                  (bs,rem) | B.length bs == 32 &&  B.null rem -> return bs
-                  _                                           -> failure
-        _ -> failure